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| n | a(n) |
|---|---|
| 1 | 551 |
| 2 | 3167 |
| 3 | 10397 |
| 4 | 59377 |
| 5 | 219871 |
| 6 | 1174669 |
| 7 | 4655229 |
| 8 | 23670949 |
| 9 | 98156723 |
| 10 | 482753329 |
| 11 | 2065407959 |
| 12 | 9935811641 |
| 13 | 43446987877 |
| 14 | 205979081813 |
| 15 | 914648934213 |
| 16 | 4295156552117 |
| 17 | 19282358693627 |
| 18 | 89994560922771 |
| 19 | 407208803726539 |
[551,3167,10397,59377,219871,1174669,4655229, 23670949,98156723,482753329,2065407959,9935811641, 43446987877,205979081813,914648934213, 4295156552117,19282358693627,89994560922771, 407208803726539] |